SCENARIO 10-13 The Amount of Time Required to Reach a Customer Service

SCENARIO 10-13
The amount of time required to reach a customer service representative has a huge impact on customer satisfaction.Below is the Excel output from a study to see whether there is evidence of a difference in the mean amounts of time required to reach a customer service representative between two hotels.Assume that the population variances in the amount of time for the two hotels are not equal.
t-Test: Two-Sample Assuming Unequal Variances

Two-Sample Tests 10-41
-Referring to Scenario 10-13,what assumptions are necessary for testing if there is evidence of a difference in the variabilities of the amount of time required to reach a customer service representative between the two hotels to be valid?

A) Both sampled populations are normally distributed.
B) Both samples are random and independent.
C) Neither (a) nor (b) is necessary.
D) Both (a) and (b) are necessary.